Muhammad Shoaib Awan ENERGY AND EXERGY ANALYSIS OF MULTISTAGE REFRIGERATION SYSTEM WITH DIFFERENT COUPLES OF REFRIGERANTS / Muhammad Shoaib Awan. - Karachi : PNEC - NUST, 2013. - xii, 83 p. : ill. ; 30cm. ISBN: Subjects--Topical Terms: MS-. Electrical Engineering Dewey Class. No.: 200